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Machine Shop and Tool Talk

chase threads but what pitch?


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  #1  
Old 04-23-2019, 06:24:39 PM
DustyBar DustyBar is offline
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Default chase threads but what pitch?

What is this tool? It appears it might be used to chase threads but each hole has the same pitch. The pitch is too fine to match the bolts I tried in it but seems to be close to pipe thread. The diameters listed on the tool don't match pipe size however. There is no manufacturer name on the tool.
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Old 04-23-2019, 06:39:03 PM
circuitman circuitman is offline
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Default Re: chase threads but what pitch?

that is the part of a flaring tool for copper pipe.this is what holds it while you flare the end.
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Old 04-23-2019, 06:42:34 PM
Jake Jacobs Jake Jacobs is offline
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Default Re: chase threads but what pitch?

Used on axles and spindles . I have one I use on my Model T Ford.
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Old 04-23-2019, 07:21:01 PM
DustyBar DustyBar is offline
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Default Re: chase threads but what pitch?

Its not a flaring tool. It doesn't have the 45 degree recess on one side to form the flare. It really appears that every size has the same pitch, about 20 tpi.
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Old 04-23-2019, 08:30:13 PM
Bill Hazzard Bill Hazzard is offline
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Default Re: chase threads but what pitch?

There is a 16 TPI thread standard that goes from 7/16" all the way to 6" and all 16 TPI.
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Old 04-23-2019, 09:31:20 PM
eddie bedwell eddie bedwell is offline
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Default Re: chase threads but what pitch?

Hi Team,
Googled this and found, as Bill said above, it is a Unified Standardized Extra Fine Thread of 16 TPI used all through the size range.
Link explains this.

https://www.gewinde-normen.de/en/16-un-thread.html

Cheers,
Eddie B.
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Old 04-24-2019, 04:06:00 PM
The Diesel Doctor The Diesel Doctor is online now
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Default Re: chase threads but what pitch?

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ID:	333364 My favorite thread chasers. They have saved my butt more than once. Metric 0.75---3.00 STD 11---32 TPI. AL
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Old 04-24-2019, 04:46:35 PM
DustyBar DustyBar is offline
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Default Re: chase threads but what pitch?

I took the time to check this tool with my thread pitch gauges. Looks like all are standard UNF for the sizes on the tool. This is no longer a mistery and it will be going to the Lathrop, MO, swap meet in a week and a half.
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Old 07-28-2019, 11:46:47 PM
Beanscoot Beanscoot is offline
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Default Re: chase threads but what pitch?

Blue Point also made one, part no. AR-6-A.

I picked one up at the flea market recently and photographed it, but I find it difficult to upload pictures to the forum so unfortunately am not attaching a picture.
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Old 08-19-2019, 02:21:53 AM
M.Canute M.Canute is offline
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Default Re: chase threads but what pitch?

I have a couple of those; I found them years ago at Princess Auto in the surplus section. Had to have them!
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Old 08-19-2019, 10:43:47 AM
Power Power is offline
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Default Re: chase threads but what pitch?

Quote:
Originally Posted by The Diesel Doctor View Post
Attachment 333364 My favorite thread chasers. They have saved my butt more than once. Metric 0.75---3.00 STD 11---32 TPI. AL
Never saw anything like that!
For 60+ years, I have been using appropriate taps with cutting oil.

When I worked as an electrician, we all had thread chasing tools that had a screwdriver handle with a tapered shank. tip is 4/40, then 6/32, 8/32, and 10/24.
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Old 08-19-2019, 11:00:26 AM
JoeCB JoeCB is offline
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Default Re: chase threads but what pitch?

What's nice about the style in the OP is that you can start it back up where the thread is good and work it back to the buggered up portion.

Joe B
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Old 08-20-2019, 05:06:28 PM
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OTTO-Sawyer OTTO-Sawyer is offline
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Default Re: chase threads but what pitch?

Quote:
Originally Posted by The Diesel Doctor View Post
Attachment 333364 My favorite thread chasers. They have saved my butt more than once. Metric 0.75---3.00 STD 11---32 TPI. AL
I have a few of those. . . First One I bought 40+ years ago while working at my Dad's Garage and then a couple More I bought 30+ years ago while working as a Machinist (and often reworking other peoples junk), along with a couple more I picked up at auctions over the years.

And Yet, I still resort to using a small triangle file from time to time rather than dig them out.

They work nice on the Lathe for touching up slightly oversized threads.

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